added C and Python support for custom reactant data

Author: markleader

docs/source/interfaces/python_api.rst

@@ -9,6 +9,11 @@ Mixture
 -------
 The :class:`~cea.Mixture` class is used to define a mixture of product or reactant species. It allows the user to specify the composition of the mixture and provides methods to compute thermodynamic curve fit properties.
 The instances of this class are then passed as inputs to the available solver classes (e.g., :class:`~cea.EqSolver`, :class:`~cea.RocketSolver`, :class:`~cea.ShockSolver`, or :class:`~cea.DetonationSolver`).
+Custom reactants can be provided through :class:`~cea.Reactant` objects (including mixed lists of strings and Reactant objects).
+For :class:`~cea.Reactant`, ``enthalpy`` and ``temperature`` are SI-only in the Python API (J/kg and K, respectively); use :mod:`cea.units` helpers for pre-conversion.
+
+.. autoclass:: cea.Reactant
+   :members:
 
 .. autoclass:: cea.Mixture
    :members:

source/bind/c/CMakeLists.txt

@@ -56,6 +56,15 @@ if (CEA_BUILD_TESTING)
         COMMAND cea_bindc_rp1311_ex3
         WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
     )
+
+    add_executable(cea_bindc_rp1311_ex5 samples/rp1311_example5.c)
+    target_link_libraries(cea_bindc_rp1311_ex5 PRIVATE cea::bindc)
+    add_test(
+        NAME cea_bindc_rp1311_ex5
+        COMMAND cea_bindc_rp1311_ex5
+        WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+    )
+
     add_executable(cea_bindc_rp1311_ex6 samples/rp1311_example6.c)
     target_link_libraries(cea_bindc_rp1311_ex6 PRIVATE cea::bindc)
     add_test(
@@ -89,4 +98,3 @@ if (CEA_BUILD_TESTING)
     )
 
 endif()
-